This is a shim module re-exporting types and functions from
the exposed Wumpus-Core modules. In most cases, importing just
this module should be sufficient to use Wumpus-Core.

Named colours ( black, white etc.) are hidden from the module
Wumpus.Core.Colour to avoid collisions with modules that
define colour sets (e.g. all the SVG colours). If named
colours are needed, Wumpus.Core.Colour can be imported
directly.

Courier metrics (charWidth, textHeight, etc.) are hidden from
the module Wumpus.Core.FontSize. As these metrics are
somewhat approximate, it is expected that if higher-level
software needs these functionality it should define its own
implementations. However the functions may be convenient and if
they are needed, Wumpus.Core.FontSize can be imported
directly.